08/07/2026
Ready for the return of Fun Fact Friday?
Today we're explaining GPS "blocks." A block is basically a satellite generation. Just like an iPhone might belong to the 16th generation, all GPS satellites do. Block I was the first GPS generation, released in the late 1970s and not available for civilian use. Here are the subsequent generations:
2️⃣ / 2️⃣ 🅰️ Block II/IIA: 1989-1997
Released in the1990s. These were the first fully functional GPS satellites.
2️⃣ 🇷 Block IIR 1997-2004
The “R” stands for “replenishment.” These satellites had better accuracy and a longer lifespan.
2️⃣ 🇷 Ⓜ️ Block IIR-M: 2005-2009
These satellites were upgraded with a second civilian signal, improving GPS service for non-military users.
2️⃣ 🇫 Block IIF: 2010-2016
These satellites had more accurate atomic clocks, longer lifespans, and a third civilian signal added for aviation.
3️⃣ 🅰️ Block IIIA: 2018-Present (last updated 2025)
This is the newest generation. These satellites have the strongest signals and are more resistant to jamming.
Explore all satellites in the GPS constellation here: https://buff.ly/r0p4r5O